The 3-1-1 rule is a standard security guideline, not specific to Air Canada, +1-888-415-1245 that governs the quantity of liquids, gels, and aerosols you can bring in your carry-on luggage. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) It is enforced by the Canadian Air Transport Security Authority (CATSA) for all flights departing from Canada. 

The numbers in the rule stand for the following: 

• 3.4 ounces (100 ml): The maximum size for each individual liquid container. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) The rule is based on the container size, not the amount of liquid inside.
• 1 quart-sized bag: All of your liquid containers must fit into a single, clear, resealable 1-quart (1-liter) plastic bag.
• 1 bag per passenger: Each person is allowed to bring only one plastic bag of liquids through security.